First Steps with OpenELEC on the Raspberry Pi 2
OpenELEC uses very little system resources for processor or memory. There's no need to use any special customization tips to get good performance with the RPi2. There's also no need to overclock the machine, reduce the resolution of videos, or use a different skin (although I really like the Amber skin).

Mandriva Linux, formerly known as Mandrake Linux, is a friendly Linux Operating System which specializes in ease-of-use for both servers and the home/office. It is freely available in many languages throughout the world. The Mandriva Linux PowerPack contains more than 2300 high-quality applications including a complete Office Suite of programs, plus installation support, for a cost of approximately 10 times less than the equivalent Microsoft Windows + MS Office cost, which comes without any technical support. Read more

eGroupWare is a Web-based GroupWare suite that is a fork of the phpGroupWare project. eGroupWare is a multi-user, web-based groupware suite developed on a custom set of PHP-based APIs. Currently available modules include: email, addressbook, calendar, infolog (notes, to-do's, phone calls), content management, forum, bookmarks etc. Read morehot

Horde Groupware is an enterprise ready browser-based collaboration suite. Users can manage and share calendars, contacts, tasks, and notes with the standards compliant components from the Horde Project. Horde Groupware bundles the separately available applications Kronolith, Turba, Nag, and Mnemo. It can be extended with any of the released Horde applications or the Horde modules that are still in development, like a file manager, a bookmark manager, a forum, or a wiki. Read morehot

MediaWiki is a Web-based collaborative editing environment originally built for the online encyclopedia project Wikipedia. It's geared to support a large number of users and pages. It requires PHP and MySQL. Read morehot

Beacon is a very simple date and category driven web site publishing system. It looks like a Blog, but behaves like a Wiki. Features include: Wiki article formatting and linking, Hierarchical categorisation of articles, RSS feed, Templated design, and more.

ccHost is a Web-based infrastructure that may be used to host and allow for commenting, remixing, and distribution globally. The more installations of ccHost and its variations, the more content there will be available for enjoyment and artistic re-use in a sane and legal setting. ccHost is what is used for the infamous Creative Commons CC Mixter project which supports legal media sharing and remixing.

Conflux Groupware is an internet-based groupware and file management solution intended to organise and facilitate the work of the client. Our aim is to optimise the time spent on company's daily activities - time management (calendar and tasks), management of clients' contact data, contracts, and search of archived documents.

(commercial) Copper is a project management and collaboration tool that allows teams to share information and files more effectively. It includes modules for clients, projects, tasks, contacts, files, and reports. It features a dynamic Flash/PHP draggable timeline, PDF invoicing, issue management, iCal/Mozilla Calendar syncing, and more.

Horde Groupware Webmail Edition is an enterprise ready browser-based communication suite. Users can read, send, and organize email messages and manage and share calendars, contacts, tasks, and notes with the standards compliant components from the Horde Project. It bundles the separately available applications IMP, Ingo, Kronolith, Turba, Nag, and Mnemo. It can be extended with any of the released Horde applications or the Horde modules that are still in development, like a file manager, a bookmark manager, a forum, or a wiki.

KONSEC Groupware is a highly scalable, cluster-capable messaging and collaboration server that is based on the open source project, Kroupware. The KONSEC Konnektor a simple client extension enables Outlook complete group functionality through the Kolab Server, which employs the open standard IMAP together with ACLs, thus enabling you to collaborate in a unique mixed Windows/Linux environment. KONSEC Kontakt is a groupware client for Linux/Unix which is based on Kmail, Korganizer, and Kaddressbook.

NullLogic Groupware is a multi-user web-based groupware package designed for contact management and event scheduling, which includes additional features such as instant messaging, public forums, shared hyperlinks, file bases, a web e-mail client, and a simple order processing system.

The OfficeSpot.Net Collaboration Server is a one-stop solution for all your groupware needs. It is based on Ubuntu 6.10 LTS and is preloaded with eGroupWare, Postfix, OpenLDAP, MySQL, DBMail, Spamassasin, and ClamAV.

PHDoc is a version of Markdoc adapted to the needs of academics. It aims to provide a lightweight alternative to large database-powered wiki systems, giving easy management of Web sites with a clean typographic layout, inspired by the beauty of LaTeX-made documents.

(commercial) Relata is a Web-based knowledge worker automation suite that helps you and your workgroup get more done in less time. It features an address book, calendar/todo list, account manager, outcomes/goals management, group email, blogs, Web documents, file sharing, and notes modules.

Scalable OGo (SOGo in short) is a groupware server built around the SOPE application server. Unlike OGo it is focused on scalability instead of depth in functionality. The web interface uses human readable URLs and can be accessed according to REST web service ideas. Notably it requires no server side session at all.

(commercial) SleekOffice is a Web-based application that allows individuals and workgroups to increase their productivity. It allows you to manage your contacts, calendar items, files, projects, and more from one interface. SleekOffice features sharing capabilities, allowing you to share information and delegate tasks among team members. You can share contacts, calendars, notes, and files easily. Additionally, you can use the sync tool to synchronize your data with Palm Desktop or Microsoft Outlook for mobile productivity.

SynchroEdit is a browser-based document editor for use by multiple users simultaneously. It is a form of same-time, different-place groupware. It allows multiple users to edit a single web-based document at the same time, and it continuously synchronizes all changes so that users always have the same version.

sYnergy Groupware is a Web-based groupware and communication solution for use with an intranet. It includes email mailboxes, a fax viewer and sending function, contact lists, an appointment and task management function, a picture database, and a function for listening to voice messages.

Tiki CMS/Groupware is a powerful web-based Groupware and Content Management System (CMS), using PHPexternal link, ADOdb and smarty. It can be used to create all sorts of Web applications, Sites, Portals, Intranets and Extranets.

transLucid (was Lucid Fried Eggs) is a web based note taking and collaboration software. Notes are stored in a web rather than in a strict hierarchy. Similar in nature to wiki, everything2 and TheBrain.